Shallow fog layer over the touchdown zone of the runway – slant visual range increase? does RVR A & B stay the same, Is prevailing visibility better or worse?

referenced the CAP GEN:
FROM CAP GEN: an approach is authorized whenever:
1. The lowest reported RVR for the runway is at or above minima, regardless of ground VIS
2. The RVR is reported to be fluctuating above and below minimum RVR
3. The ground vis is reported to be at least ¼ mile
4. The RVR for the runway is unavailable or not reported
5. ATS is informed that an aircraft is on a training flight and will conduct a planned missed approach.

SAMRA 016
quite hard in the way that they state their answers ie. for HF Radio, 2 of the options were correct - not the most correct, they were simply both correct statements I chose short for day and long for night and got it right but there was also an option that said HF and LF.
VOR, RMI and HSI questions
more MET theory on cloud formation (ACWM helped me alot on this)
PROG chart
standard GFA, METAR, TAF, NOTAMS
function of PSR radar
change in wind from surface to boundary layer
effect of low level wind shear (know the air command + performance shear vs - perfermance shear and what it does to headwind/tailwind and A/S
GPS KLN 94 - showing CDI and asking what direction and how much to turn to get back on track
low level airway dimensions
standard ICING and T-storm stuff
flight plan rules
advantages of a/c lightning detection equip - main thing here is that it IS able to detect turbulence in clouds with little to no precip
GPS questions for ALT requirements

SAMRA014
answers easier to understand more straight forward
NO VOR, RMI OR HSI
SAT IR AND VIS IMAGES
WX RADAR display - asking what the hook meant (no option in answers for hail or turbulence)
Cockpit Management System - asking components that comprise the system
Effect of shallow ground fog over touchdown zone - answers RVR A&B the same, B better than A, Prevailing vis better ?
Pressure level temps
Effect of temp on indicated alt
Jet stream on sig wx and gfa - asking why the jet stream changed direction (i thought it was because of Coriolis force, its not)
nav equipment for NAT MNPS - one long range nav or one short range nav (i thought it was one long range, its not)
standard ICING and T-storm stuff
on course-parameters of an ILS system
GPS questions
equipment failure in controlled airspace - what do you do?
altimeter question - when its beyond 31.00 what do you do?

My advice is to know MET from ACMW, aerocourse work book helped alot and i was fortunate to have an aerocourse ATPL binder used from their course and that provided very good minute detail stuff that they put in the answers. if you overlook the minute/minor details you will get stuck in knowing which answer is the most correct one.

Shallow fog layer over the touchdown zone of the runway – slant visual range increase? does RVR A & B stay the same, Is prevailing visibility better or worse?

referenced the CAP GEN:
FROM CAP GEN: an approach is authorized whenever:
1. The lowest reported RVR for the runway is at or above minima, regardless of ground VIS
2. The RVR is reported to be fluctuating above and below minimum RVR
3. The ground vis is reported to be at least ¼ mile
4. The RVR for the runway is unavailable or not reported
5. ATS is informed that an aircraft is on a training flight and will conduct a planned missed approach.

based on TC answers I wasn't sure which one to choose.

RVR A is at the threshold, RVR B is mid point. The assumption here is that the shallow fog IS ONLY over the touchdown zone, which means only RVR A is obstructed, not RVR. So the answer should be RVR A is less than RVR B.

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